Is my son eating enough?

My son is 6 1/2 months. He is only eating 3 times a day. We eat a jar of baby food (4 oz jar), either fruit or veggies, and a 7 1/2 bottle. at 10 am and 3 pm. All the bottles are made with equal parts of cereal to formula. He eats a tbs of oatmeal and 8-81/2 bottle before bed.
With everything I have read it seems to me that he might not be getting enough formula. The doc said that if he is still hungry that I can increase his solids....but I am concerned about him getting all the nutrients from the formula.
Anyone ever had this problem? Advice??

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